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Tantalum is a chemical element; it has symbol Ta and atomic number 73. ... Bimetallic coins minted by the Bank of Kazakhstan with silver ring and tantalum center.
Sterling silver is an alloy composed by weight of 92.5% silver and 7.5% other metals, usually copper. The sterling silver standard has a minimum millesimal fineness ...
47 Ag silver; use 2.89 nΩm 14.67 nΩm 15.87 nΩm 16.17 nΩm 16.29 nΩm ... 73 Ta tantalum; use 26.2 nΩm 122 nΩm 131 nΩm 134 nΩm 135 nΩm 229 nΩm
The table below shows some of the parameters of common superconductors.X:Y means material X doped with element Y, T C is the highest reported transition temperature in kelvins and H C is a critical magnetic field in tesla.
The gold and silver Croeseids formed the world's first bimetallic monetary system, c. 550 BC. [6] The Persian daric was also an early gold coin which, along with a similar silver coin, the siglos, (from Ancient Greek σίγλος, Hebrew שֶׁקֶל ) represented the bimetallic monetary standard of the Achaemenid Persian Empire. [7]
[5] [6] Various amalgams of silver and mercury or other metals and mercury do occur rarely as minerals in nature. An example is the mineral eugenite (Ag 11 Hg 2) and related forms. [7] Silver nuggets, wires, and grains are relatively common, but there are also a large number of silver compound minerals owing to silver being more reactive than gold.
Silver is often found as a by-product during the retrieval of copper, lead, zinc, and gold ores. [12] Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes alongside gold: [13] while it is more abundant than gold, it is much less abundant as a native metal. [14]
A compound semiconductor is a semiconductor compound composed of chemical elements of at least two different species. These semiconductors form for example in periodic table groups 13–15 (old groups III–V), for example of elements from the Boron group (old group III, boron, aluminium, gallium, indium) and from group 15 (old group V, nitrogen, phosphorus, arsenic, antimony, bismuth).